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Paper   IPM / Physic / 8761
School of Physics
  Title:   Superstring Scattering from O-planes
  Author(s):  M.R. Garousi
  Status:   Published
  Journal: Nucl. Phys. B
  Vol.:  765
  Year:  2007
  Pages:   166-184
  Supported by:  IPM
We write the vertex operators of massless NS-NS and RR states of Type II superstring theory in the presence of Orientifold p-planes. They include the usual vertex operators of Type II theory and their images. We then calculate the two-point functions of these vertex operators at the projective plane PR_2 level. We show that the result can be written in the Veneziano-type formulae, with the same kinematic factor that appears in the D_p-branes amplitudes. While the scattering amplitudes with the usual vertex operators are not gauge invariant, the above amplitudes are invariant. From the amplitude describing scattering of two NS-NS states off the O-plane, we find the low energy effective action of O-planes. The result shows a relative factor 2^p-6 between couplings to O-planes and to D-branes at (')^2 order.

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